Abstract
The complexation of samarium(III) with disodium 2-(2-hydroxy-3-sulfo-5-nitrophenylazo)naphthalene-1,8-dihydroxy-3,6-disulfonate (R) was studied in the presence and absence of cetyltrimethylammonium bromide (CTMABr). Monoligand SmR and mixed-ligand SmR-CTMABr complexes were formed at pH 6 and showed light absorption maxima at 531 and 529 nm, respectively. The formation constants (logK1 ) of SmR and SmR-CTMABr complexes were 4.06 ± 0.04 and 4.99 ± 0.04, respectively. The ratios of components in monoligand and mixed-ligand complexes were found to be 1 : 2 and 1 : 1 : 1, respectively. Beer's law was obeyed in solutions containing 1.20–7.20 and 1.20–9.60 µg/mL Sm, respectively. A procedure for the photometric determination of samarium in monazite was developed.
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